Y24-289 - [BUG] Exception 29/08/2024 at 15:28

[harrietc52]

Email subject line

[Psd-exceptions] [Sequencescape Production] searches#index (ActionView::Template::Error) "uninitialized constant Barcode::FormatHandlers:...

Error body

An ActionView::Template::Error occurred in searches#index:

  uninitialized constant Barcode::FormatHandlers::AkerBarcode
  app/models/barcode.rb:222:in `const_get'

Acceptance Criteria

• Look into this exception and fix the code to handle the exception sensibly.
• Document the root cause and solution in a comment on this issue.

Additional information

The id of the user who triggered this error is often shown in the exception email, in case you need to communicate with them.

[stevieing]

@wendyyang More context. This is happening because someone is running a Sequencescape search /searches?type=&q=7747.

It looks like they are doing a search for study 7747 but because they are not specifiying a type it is actually looking for everything with an id of 7747.

We probably don't want it to fail but it is worth a check on how it is handled.

It will be difficult to reproduce in UAT as we might not have any Aker barcodes in the table.

[neilsycamore]

This exception is raised in the Sequencescape console when calling labwhere_location on a Labware object that has an aker_format (id = 4) barcode AND/OR calling human_barcode
e.g.
l = Labware.find 23061777
l.labwhere_location
/var/www/sequencescape/releases/20240920142713/app/models/barcode.rb:222:in `const_get': uninitialized constant Barcode::FormatHandlers::AkerBarcode (NameError)

l.human_barcode
/var/www/sequencescape/releases/20240920142713/app/models/barcode.rb:222:in `const_get': uninitialized constant Barcode::FormatHandlers::AkerBarcode (NameError)

Barcode::FormatHandlers.const_get(handler_class_name, false)
                       ^^^^^^^^^^

I've come across this when writing reports in Ruby and have handled this with:

class Labware
  def find_location()
    if self.barcodes.map(&:format).include?("aker_barcode")
      location = nil
    else
      location = self.labwhere_location
    end
    return location
  end
  
  def find_barcode()
    if self.barcodes.empty?
      barcode = "Not found"
      return barcode
    else
      bad = ["external","aker_barcode"]
      barcode = self.barcodes.where.not(format: bad).first.barcode
      return barcode
    end
  end
end

[neilsycamore]

barcodes = Barcode.where(format:4)
labware  = barcodes.map(&:asset)

using the above method

labware.map(&:find_barcode)
=> ["NT1457915H", "DN537747W", "DN537868H", "DN537869I", "DN537870B", "DN538319K", "NT1462400Q", "DN538443N", "DN552057Q"]

DN537747W is the barcode being matched in the search